EP2984542B1 - Portable device using passive sensor for initiating touchless gesture control - Google Patents

Portable device using passive sensor for initiating touchless gesture control Download PDF

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Publication number
EP2984542B1
EP2984542B1 EP14783313.1A EP14783313A EP2984542B1 EP 2984542 B1 EP2984542 B1 EP 2984542B1 EP 14783313 A EP14783313 A EP 14783313A EP 2984542 B1 EP2984542 B1 EP 2984542B1
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EP
European Patent Office
Prior art keywords
light
pattern
portable device
sensor
controller
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EP14783313.1A
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German (de)
English (en)
French (fr)
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EP2984542A1 (en
EP2984542A4 (en
Inventor
Paul CRONHOLM
Martin HENRIZ
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Crunchfish AB
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Crunchfish AB
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3231—Monitoring the presence, absence or movement of users
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/002—Specific input/output arrangements not covered by G06F3/01 - G06F3/16
    • G06F3/005—Input arrangements through a video camera
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/038—Indexing scheme relating to G06F3/038
    • G06F2203/0381—Multimodal input, i.e. interface arrangements enabling the user to issue commands by simultaneous use of input devices of different nature, e.g. voice plus gesture on digitizer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04108—Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/20—Movements or behaviour, e.g. gesture recognition
    • G06V40/28—Recognition of hand or arm movements, e.g. recognition of deaf sign language
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/65—Control of camera operation in relation to power supply
    • H04N23/651—Control of camera operation in relation to power supply for reducing power consumption by affecting camera operations, e.g. sleep mode, hibernation mode or power off of selective parts of the camera
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Definitions

  • This application relates to a method, a computer-readable medium and a portable device, such as a mobile communications terminal, having a passive sensor and utilizing the passive sensor for initiating touchless gesture control.
  • Touchless gesture control based on camera capture requires that the camera is either always turned on and continuously analyses gestures in front of the camera to determine if the gesture is for controlling the device or for another purpose. Alternatively the device is manually turned on to receive touchless input.
  • the camera is always switched on it draws a lot of power, which is highly unsuitable for a portable device, such as a mobile communications terminal for example a smartphone or a tablet computer, running on battery power. It is also damaging to the environment as power is used even when not necessarily needed.
  • some portable devices enable the user to manually switch on the camera when needed. This requires manual hands-on operation which is in contrast to the concept of touchless interaction.
  • US 2013/0009875 A1 discloses to activate a camera for gesture detection when an object (e.g. a user's hand) is detected within a predetermined range by a proximity sensor.
  • an object e.g. a user's hand
  • WO 96/36960 discloses to activate a circuit for detecting a touchless gesture when a decrease in ambient light is detected by a light sensitive sensor.
  • the inventors of the present invention have realized, after inventive and insightful reasoning that by utilizing a passive light environment sensor, such as an ambient light sensor or a passive proximity sensor, it is possible to indirectly detect a gesture.
  • a passive light environment sensor such as an ambient light sensor or a passive proximity sensor
  • the passive light environment sensor is not able or arranged to detect an object performing a gesture
  • the inventors have realized the simple solution to utilize such a passive light environment sensor to indirectly detect the gesture. Since such sensors are often already arranged in portable devices such as a mobile communications terminal, the invention disclosed herein may beneficially be used as a software solution for already existing hardware. Especially so in combination with the object tracking manner disclosed in CF001SE.
  • a portable device comprising a controller, a memory, a camera and a passive proximity sensor
  • the controller is configured to receive input from said passive proximity sensor indicating a light environment in front of the passive proximity sensor, detect a change in light environment, determine a light pattern of changes in light environment, determine if the light pattern matches a stored initiating pattern, which is stored in the memory, and if so, accept the light pattern and in response thereto activate the camera, identify an object in front of the camera and track the object thereby enabling touchless gesture control of the portable device, characterized in that the passive proximity sensor is an ambient light sensor and the light pattern consists of a series of changes between dark and light (dark is light below a threshold, light is light above a second threshold).
  • Such a portable device enables for an improved initiation of a touchless gesture control as it reduces the power needed while still enabling the initiation to be done in a touchless manner.
  • the reason why the power is reduced is because the passive proximity sensor requires much less power than a camera and the recognition of a light changing pattern also requires less computing power (and hence less power) than the recognition of an object performing a gesture.
  • a passive sensor requires much less power than an active sensors, such as cameras and can thus be used at a very low power cost while keeping the active camera deactivated - thereby significantly reducing the power consumption of the device.
  • the camera is not started unnecessarily, but only when there actually is a user that wants to use the device.
  • a light pattern is not to be equated with a simple change in light intensity, but would require distinct changes, such as either very sudden or preferably repeated changes.
  • the portable device is a mobile communications terminal such as a tablet computer, a smartphone or a laptop computer. In one embodiment, the portable device is a game console. In one embodiment, the portable device is a media device such as a music and/or video playing device.
  • the teachings herein find use in control systems for devices having user interfaces such as mobile phones, smart phones, tablet computers, laptop computers, gaming consoles and media and other infotainment devices.
  • Figure 1 generally shows a portable device 100 according to an embodiment herein.
  • the portable device 100 is configured for network communication, either wireless or wired.
  • Examples of a portable device 100 are: a laptop computer, a tablet computer, a mobile communications terminal such as a mobile telephone or a smart phone, a personal digital assistant and a game console.
  • Two embodiments will be exemplified and described as being a smartphone in figure 1A , a laptop computer 100 in figure 1B as an example of a computer and a tablet computer.
  • a mobile communications terminal in the form of a smartphone 100 comprises a housing 110 in which a display 120 is arranged.
  • the display 120 is a touch display.
  • the display 120 is a non-touch display.
  • the smartphone 100 comprises two keys 130a, 130b. In this embodiment there are two keys 130, but any number of keys is possible and depends on the design of the smartphone 100.
  • the smartphone 100 is configured to display and operate a virtual key 135 on the touch display 120. It should be noted that the number of virtual keys 135 are dependant on the design of the smartphone 100 and an application that is executed on the smartphone 100.
  • the smartphone 100 is also equipped with a camera 160.
  • the camera 160 is a digital camera that is arranged to take video or still photographs by recording images on an electronic image sensor (not shown).
  • the camera 160 is an external camera.
  • the camera is alternatively replaced by a source providing an image stream.
  • the smartphone 100 is further equipped with a passive proximity sensor possibly being a passive light environment sensor 170.
  • the passive proximity sensor 170 is a sensor 270 as disclosed below with reference to figure 2 .
  • a laptop computer 100 comprises a display 120 and a housing 110.
  • the housing comprises a controller or CPU (not shown) and one or more computer-readable storage mediums (not shown), such as storage units and internal memory. Examples of storage units are disk drives or hard drives.
  • the laptop computer 100 further comprises at least one data port. Data ports can be wired and/or wireless. Examples of data ports are USB (Universal Serial Bus) ports, Ethernet ports or WiFi (according to IEEE standard 802.11) ports. Data ports are configured to enable a laptop computer 100 to connect with other computing devices or a server.
  • USB Universal Serial Bus
  • Ethernet ports accordinging to IEEE standard 802.11
  • the laptop computer 100 further comprises at least one input unit such as a keyboard 130.
  • input units such as a keyboard 130.
  • Other examples of input units are computer mouse, touch pads, touch screens or joysticks to name a few.
  • the laptop computer 100 is further equipped with a camera 160.
  • the camera 160 is a digital camera that is arranged to take video or still photographs by recording images on an electronic image sensor (not shown).
  • the camera 160 is an external camera.
  • the camera is alternatively replaced by a source providing an image stream.
  • the smartphone 100 is further equipped with a passive proximity sensor possibly being a passive light environment sensor 170.
  • the passive proximity sensor 170 is a sensor 270 as disclosed below with reference to figure 2 .
  • FIG. 2 shows a schematic view of the general structure of a device according to figure 1 .
  • the device 100 comprises a controller 210 which is responsible for the overall operation of the computing device 200 and is preferably implemented by any commercially available CPU ("Central Processing Unit"), DSP ("Digital Signal Processor") or any other electronic programmable logic device.
  • the controller 210 is configured to read instructions from the memory 240 and execute these instructions to control the operation of the computing device 100.
  • the memory 240 may be implemented using any commonly known technology for computer-readable memories such as ROM, RAM, SRAM, DRAM, CMOS, FLASH, DDR, SDRAM or some other memory technology.
  • the memory 240 is used for various purposes by the controller 210, one of them being for storing application data and program instructions 250 for various software modules in the computing device 200.
  • the software modules include a real-time operating system, drivers for a user interface 220, an application handler as well as various applications 250.
  • the computing device 200 further comprises a user interface 220, which in the computing device of figures 1A and 1B is comprised of the display 120 and the keys 130, 135.
  • the computing device 200 may further comprises a radio frequency interface 230, which is adapted to allow the computing device to communicate with other devices through a radio frequency band through the use of different radio frequency technologies.
  • radio frequency interface 230 is adapted to allow the computing device to communicate with other devices through a radio frequency band through the use of different radio frequency technologies. Examples of such technologies are IEEE 802.11, IEEE 802.15, ZigBee, WirelessHART, WIFI, Bluetooth®, W-CDMA/HSPA, GSM, UTRAN and LTE to name a few.
  • the computing device 200 is further equipped with a camera 260.
  • the camera 260 is a digital camera that is arranged to take video or still photographs by recording images on an electronic image sensor (not shown).
  • the camera 260 is operably connected to the controller 210 to provide the controller with a video stream 265, i.e. the series of images captured, for further processing possibly for use in and/or according to one or several of the applications 250.
  • the camera 260 is an external camera or source of an image stream.
  • the smartphone 200 is further equipped with a passive proximity sensor 270.
  • the passive proximity sensor 270 is a passive light environment sensor.
  • a passive light environment sensor is a sensor 170, 270 arranged to detect the light environment in front of the sensor 170, 270.
  • the detection is made passively, without actively sending, transmitting or radiating any signal or other waveform such as infrared light or other light types.
  • the passive light environment sensor is only arranged to detect the light environment - i.e. to discern between light/dark (possibly in different degrees), not to make photographic captures.
  • One example of such a passive light environment sensor is an ambient light sensor, ALS.
  • An ambient light sensor is a specific version of a photodiode.
  • a photodiode is a type of photo detector capable of converting light into a voltage or current, this depends on the mode of operation.
  • a benefit of Ambient Light Sensors is that they perceive brightness in the same way as human eyes do. Another benefit is that only require a minimum of (battery) power.
  • the passive light environment sensor is not designed to track an object and to provide detailed light data. Only a reading on the ambient light environment is provided by the passive light environment sensor.
  • the ALS is also not originally arranged to detect any movement or motions. Only the ambient light level. Further more am ALS does not require additional hardware such as LED or an infrared light source.
  • the ALS is a preferred embodiment in that it is capable of detecting light levels in fine grade, does not require additional hardwire, is already implemented in many portable devices and thus allow for a simple software update to enable a portable device to operate according to the teachings herein, and it does not add to the cost of making new portable devices as they would most likely be equipped with an ALS for other purposes anyway. Furthermore the ALS has a superior power consumption which is in line with the problem to be solved.
  • passive proximity sensors are electrical, capacitive and magnetic sensors arranged possibly not to detect the actual light in font of the sensor, but to detect a presence of an object in front of the sensor or possibly the distance to the object.
  • the proximity to an or presence of an object may be an equivalent to a light environment in that dark equals close and light equals remote.
  • the distance to or presence of an object to the sensor will thus indicate a light environment in front of the sensor.
  • a proximity pattern is thus equal to a light pattern for the purpose of describing the functionality of this invention.
  • a light pattern is not to be equated with a simple change in light intensity, but would require distinct changes, such as either very sudden or preferably repeated changes.
  • the passive proximity sensor 170 is not originally arranged to detect and track an object for identifying a gesture, it is only arranged to passively detect another physical entity, such as light level or capacitance, but the input may inventively be used to indirectly identify a gesture.
  • Such a sensor is possibly also envisioned to be part of a portable device's finished design and the use thus does not add to the cost of the finished portable device.
  • the functionality may also be implemented in existing portable devices already equipped with such a sensor.
  • a passive sensor requires much less power than the use of an active sensor such as a motion sensor and that it requires inventive thought, as has been the case for this application, to realize that the passive sensor may be used to indirectly function as a gesture detection means.
  • references to 'computer-readable storage medium', 'computer program product', 'tangibly embodied computer program' etc. or a 'controller', 'computer', 'processor' etc. should be understood to encompass not only computers having different architectures such as single /multi- processor architectures and sequential (Von Neumann)/parallel architectures but also specialized circuits such as field-programmable gate arrays (FPGA), application specific circuits (ASIC), signal processing devices and other devices.
  • References to computer program, instructions, code etc. should be understood to encompass software for a programmable processor or firmware such as, for example, the programmable content of a hardware device whether instructions for a processor, or configuration settings for a fixed-function device, gate array or programmable logic device etc.
  • Figure 3 shows a schematic view of a computer-readable medium as described in the above.
  • the computer-readable medium 30 is in this embodiment a data disc 30.
  • the data disc 30 is a magnetic data storage disc.
  • the data disc 30 is configured to carry instructions 31 that when loaded into a controller, such as a processor, executes a method or procedure according to the embodiments disclosed above.
  • the data disc 30 is arranged to be connected to or within and read by a reading device 32, for loading the instructions into the controller.
  • a reading device 32 in combination with one (or several) data disc(s) 30 is a hard drive.
  • the computer-readable medium can also be other mediums such as compact discs, digital video discs, flash memories or other memory technologies commonly used.
  • the instructions 31 may also be downloaded to a computer data reading device 34, such as a laptop computer or other device capable of reading computer coded data on a computer-readable medium, by comprising the instructions 31 in a computer-readable signal 33 which is transmitted via a wireless (or wired) interface (for example via the Internet) to the computer data reading device 34 for loading the instructions 31 into a controller.
  • a computer data reading device 34 such as a laptop computer or other device capable of reading computer coded data on a computer-readable medium
  • the computer-readable signal 33 is one type of a computer-readable medium 30.
  • the instructions may be stored in a memory (not shown explicitly in figure 3 , but referenced 240 in figure 2 ) of the laptop computer 34.
  • references to computer program, instructions, code etc. should be understood to encompass software for a programmable processor or firmware such as, for example, the programmable content of a hardware device whether instructions for a processor, or configuration settings for a fixed-function device, gate array or programmable logic device etc.
  • Figure 4A shows an example portable device such as in figure 1 , in this example a laptop computer 100 such as the laptop computer 100 of figure 1B , configured to detect and track an object, in this example a hand H, via the camera 160.
  • a laptop computer 100 such as the laptop computer 100 of figure 1B
  • FIG. 4A shows an example portable device such as in figure 1 , in this example a laptop computer 100 such as the laptop computer 100 of figure 1B , configured to detect and track an object, in this example a hand H, via the camera 160.
  • an object H is detected and tracked is disclosed in the Swedish patent application SE 1250910-5 and will not be discussed in further detail in the present application.
  • Swedish patent application please see the mentioned Swedish patent application. It should be noted, however, that the teachings of the present application may be implemented through the use of other tracking manners than disclosed in Swedish patent application SE 1250910-5.
  • the portable device 100 is arranged to turn off the camera 160 when touchless input is not to be received.
  • the portable device 100 may be configured to turn off the camera when a touchless input has not been identified or received within a threshold time period indicating inactivity.
  • the portable device 100 is arranged with a passive proximity sensor 170, such as a passive light environment sensor 170.
  • a passive proximity sensor 170 such as a passive light environment sensor 170.
  • sensors 170 are commonly found in prior art portable devices.
  • the sensor 170 of the portable device 100 according to the teachings of the present application is arranged, possibly in combination with the controller (referenced 210 in figure 2 ), to detect a movement pattern in front of the sensor and to identify a gesture from this movement and in response thereto activate the camera 160 for receiving an image stream in which objects, such as a user's hand, may be tracked for touchless control.
  • a user uses his hand H or other object to perform a gesture in front of the sensor 170 which gesture is detected by the laptop 100 by detecting a light changing pattern P.
  • a user moves his hand H from a position HI at a distance D1 from the laptop 100 to a second position H2 at a second, closer distance D2 to the laptop 100.
  • the light environment in front of the sensor 170 has changed to darker compared to when the hand is at position HI as the hand H will block more light from reaching the sensor 170.
  • the movement pattern results in the sensor 170 being alternatively shaded thus causing a light changing pattern to be generated.
  • the light changing pattern corresponding to the movement pattern is illustrated as black and white boxes in a series and referenced P in figure 4A . As can be seen in figure 4A the movement pattern generates the light changing pattern P "light/dark/light/dark/light".
  • the controller matches the received light changing pattern to a stored pattern and if there is a match the controller 210 activates the camera and the laptop 100 can be controlled in a touch less manner.
  • the controller 210 is configured to receive light input 510 from a passive light environment sensor 170 indicating a light environment in front of the passive light environment sensor and to detect a change 520 in the light environment.
  • the controller further determines 530 a pattern of changes in light environment, i.e. a light changing pattern and determines if the light pattern P matches 540 a stored initiating pattern, which is stored in the memory, and if so, accept the light pattern and in response thereto activate 550 the camera 160, identify an object, such as the user's hand H, in front of the camera 160 and track the object H thereby enabling touchless gesture control of the portable device 100.
  • the light pattern consists of a series of changes between dark and light (dark is light below a threshold, light is light above a second threshold). Such changes are preferably rapid - as would be the case if a user performed a gesture in front of the ALS - and not a gradual change - as would occur for example at dusk or at dawn.
  • the changes are in a time relation with each other.
  • the changes may be in a time-relation to the full pattern and wherein the controller is configured to buffer the detected light changes and detect the light pattern by retro-checking the received light input. That is the light changes are buffered and parsed backwards for determining if a light pattern has been detected.
  • the whole pattern has to be buffered before a time frame can be established for determining if the time relation is fulfilled or not for the pattern.
  • the controller is determined to determine that a change happens within a time period. For example, the light/dark/light of a push gesture should be so that each segment is less than 0.3 s and that the total sequence is less than 0.5 s.
  • the controller is configured to determine that a light change in a sequence has approximately the same time extension as the average of the other changes in the light sequence.
  • time relation of a time change may relate to the time it actually takes to change from one light condition to another or to the time for each light environment state.
  • controller is further configured to determine a direction in which a change in light occurs and wherein the light pattern further consists of the directions of the light changes.
  • the example of figure 4B shows an example of such a pattern.
  • the controller is further configured to prompt for a confirmation and detect a confirmation light pattern and determine if the confirmation light pattern indicates a confirmation and if so accept the light pattern.
  • a confirmation light pattern may be a push pattern (that is light/dark/light) or a repeat of the detected light pattern. The latter enables more advanced control. Using a repeat of the pattern is highly useful if the pattern is a simple pattern - or it becomes cumbersome to input a long range of patterns.
  • the prompt may be displayed on the display 120, possibly as a popup window, instructing the user to perform the confirmation input.
  • the prompt may also or alternatively be an audible prompt instructing the user to perform the confirmation input.
  • the portable device 100 may also be arranged with a movement sensor (not shown), such as an accelerometer or gyro (not shown).
  • a movement sensor such as an accelerometer or gyro (not shown).
  • Such movement sensors are commonly found in portable devices and thus also do not require any modification to the hardware of a portable device.
  • the controller is configured to receive movement input from the movement sensor and determine if the portable device is moving or not while detecting the light pattern. If it is determined that the portable device is not moving the detected light pattern most likely is a consciously effected light pattern originating from a gesture and the pattern is accepted and the camera is activated.
  • controller is further configured to prompt for a confirmation if it is detected that the portable device is moving while detecting the light pattern.
  • the controller is further configured to determine if the detected movement constitutes a moving pattern and if the moving pattern matches the light pattern. If so the light pattern is most likely a result of the movement and it is discarded, or the controller prompts for confirmation.
  • the movement pattern can be matched to the light pattern by comparing changes in direction with changes in light. If there is a correspondence there could be a match between the two patterns.
  • Figure 4B shows an example computing device such as in figure 1 , in this example a laptop computer 100 such as the laptop computer 100 of figure 1B , configured to detect and track an object, in this example a hand H, via the camera 160.
  • the laptop 100 is arranged with a sensor 170 which is able to detect in what direction the light changes (for example, from left to right). This enables for other movement patterns to be used.
  • a second example is given where a user moves his hand H from left to right and back again at a distance D from the laptop 100. This movement pattern is illustrated with the arrows in figure 4B .
  • the sensor 170 As the hand H passes the sensor 170, the sensor 170 is first partially blocked, blocked, partially blocked and finally not blocked again.
  • the movement pattern results in the sensor 170 being alternatively shaded thus causing a light changing pattern to be generated.
  • the light changing pattern corresponding to the movement pattern is illustrated as black and white boxes in a series and referenced P in figure 4B .
  • the sensor is able to determine that the partial blocking is on a left or right side respectively thereby generating a partial light box in the light changing pattern.
  • the movement pattern generates the light changing pattern P "light/half dark left/half dark right/dark/half dark left/half dark right/light/half dark right/half dark left/dark/half dark right/half dark left/light".
  • the camera 160 After recognizing the light changing pattern the camera 160 is activated and the laptop can be controlled in a touch less manner.
  • the portable device is arranged with more than one sensor 170.
  • the use of multiple sensors 170 enables for detecting a more complex pattern in that angles to an object may be determined. Furthermore, movement patterns may be more easily identifiable.
  • Figure 4C shows an example of a portable device 100 having two sensors 170a and 170b.
  • An object such as a hand H
  • the hand H is moved from one position HI in front of the first sensor 170a to a second position H2 in front of the second sensor 170b and back again.
  • the resulting pattern P is detected as two sub-patterns Pa and Pb for the first and the second sensor 170a and 170b respectively.
  • Pa is dark/light/dark
  • Pb is light/dark/light.
  • the two sub-patterns are, in one embodiment, timed with each other so that the pattern changes occur at approximately the same time or even overlapping.
  • the teachings herein provide the benefit that a user is able to initiate the touchless interface with a touchless command and not having to actually activate a special key or other manual input means, while the apparatus is able to reduce its power consumption as the camera 160 does not need to be active waiting to detect a gesture.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • User Interface Of Digital Computer (AREA)
  • Telephone Function (AREA)
EP14783313.1A 2013-04-11 2014-04-03 Portable device using passive sensor for initiating touchless gesture control Active EP2984542B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1350454A SE537579C2 (sv) 2013-04-11 2013-04-11 Bärbar enhet nyttjandes en passiv sensor för initiering av beröringsfri geststyrning
PCT/SE2014/050404 WO2014168558A1 (en) 2013-04-11 2014-04-03 Portable device using passive sensor for initiating touchless gesture control

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EP2984542A1 EP2984542A1 (en) 2016-02-17
EP2984542A4 EP2984542A4 (en) 2016-11-16
EP2984542B1 true EP2984542B1 (en) 2018-08-29

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US (1) US9733763B2 (zh)
EP (1) EP2984542B1 (zh)
CN (1) CN105144034B (zh)
SE (1) SE537579C2 (zh)
WO (1) WO2014168558A1 (zh)

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Publication number Publication date
US9733763B2 (en) 2017-08-15
US20160054858A1 (en) 2016-02-25
CN105144034B (zh) 2018-11-13
EP2984542A1 (en) 2016-02-17
WO2014168558A1 (en) 2014-10-16
CN105144034A (zh) 2015-12-09
SE537579C2 (sv) 2015-06-30
EP2984542A4 (en) 2016-11-16
SE1350454A1 (sv) 2014-10-12

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